Insights /Risk & Insurance
How to Read a Trades Staffing Agency's Certificate of Insurance
Two certificates can show identical dollar amounts and leave you with completely different exposure. Here's what actually matters before a crew steps on site.
Contractors & GCs7 min read
A certificate of insurance protects you only if you're named additional insured with the right endorsement form, the coverage is primary and noncontributory, there's a waiver of subrogation, and the limits haven't already been eroded by the agency's other active jobs. The dollar figures alone tell you almost nothing.
The COI Isn't a Formality — It's the Only Proof You Have
Most staffing orders get papered with a master services agreement full of standard indemnification language, and everyone assumes that language is what protects the general contractor if something goes wrong. It isn't, at least not by itself. When a staffed electrician drops a fixture on a customer's fixed asset, or a pipefitter gets hurt on your site, the document that actually determines who's paying is the certificate of insurance the agency filed before mobilization — and specifically, whether the coverage described on it actually reaches you.
The problem is that a COI is a summary, not a contract. It's a one-page ACORD 25 form a broker generates on request, and it tells you what exists in broad strokes — carrier, policy number, limits, dates. It does not attach the actual additional insured endorsement, and it does not tell you whether that endorsement covers ongoing work, completed work, or both. Project engineers file the COI in a folder and move on. That's the exact habit that turns a routine incident into a six-figure coverage dispute eighteen months later.
The Five Fields That Actually Matter
Ignore the big limit numbers for a second and check five things instead. First, additional insured status — are you actually named, and on what endorsement form (more on this below). Second, primary and noncontributory wording — without it, your own GL policy could be forced to respond first, or split the loss with the agency's carrier, which defeats the purpose of requiring the agency to carry coverage at all. Third, a waiver of subrogation in your favor, so the agency's workers comp carrier can't turn around and sue you after paying out a claim for an injury that happened on your site. Fourth, aggregate limits and how they're structured — per-occurrence versus general aggregate, and whether that aggregate is shared across every job the agency is running or set per-project. Fifth, the workers comp section — specifically whether there's an alternate employer endorsement, which extends the agency's comp coverage to work performed at your site under your direction.
Any staffing partner running trades on commercial and industrial sites should be able to produce specimen copies of the actual endorsements, not just the summary certificate. If a rep can only send you the COI and can't produce the CG 20 10 or CG 20 37 form language behind it, that's the tell that nobody there has actually confirmed what's in force.
The Additional Insured Trap: Certificate Holder Isn't the Same as Insured
This is the single most common misread on a jobsite. Being listed as the "certificate holder" at the top of the COI means you receive a copy of the certificate — it does nothing else. It does not make you an additional insured, does not extend you any coverage, and does not obligate the carrier to notify you of anything beyond what the form says. Additional insured status has to be a separate, explicit endorsement, and it shows up further down the form or on an attached schedule.
Even when you are named additional insured, the endorsement form matters. A CG 20 10 typically covers ongoing operations — work actively being performed. A CG 20 37 extends that to completed operations, meaning coverage continues after the staffed trade has left the site, which matters for warranty periods, punch-list disputes, and any claim that surfaces after the crew is gone. If your subcontract or purchase order requires completed-operations coverage and the agency only carries the 20 10 form, you have a gap that won't show up until someone files a claim six months into the warranty window.
A Worked Example: Two COIs, Same Numbers, Different Exposure
Say two agencies each hand you a COI showing $1M per-occurrence and $2M general aggregate on general liability, with $1M workers comp. On paper, identical. Agency A is running crews on six active jobsites this policy year, all drawing against that same $2M aggregate — if two of those jobs have already had claims totaling $1.5M, there's only $500K left standing behind your project, regardless of what the certificate says today. Agency B carries a per-project aggregate endorsement, so the $2M behind your job is ring-fenced and unaffected by claims anywhere else in their book.
You can't tell the difference between Agency A and Agency B by looking at the certificate alone — the aggregate structure lives in the policy, not the summary form. This is exactly why a broker confirmation call, not just a filed PDF, belongs in your mobilization checklist for any job with meaningful schedule or safety exposure.
Building a Two-Minute Verification Habit
None of this requires a risk management department. It requires a short, repeatable habit attached to your existing onboarding checklist, alongside license and certification verification. Before a crew mobilizes: request the specimen additional insured endorsement, not just the certificate. Confirm the endorsement form number matches what your contract requires (ongoing versus completed operations). Confirm primary and noncontributory language is present, not just referenced. Confirm the waiver of subrogation runs in your favor by name. Call the broker listed on the certificate to confirm the policy is currently active — a five-minute call, and brokers expect it.
Then calendar the renewal date. Certificates expire mid-project constantly, and the gap between an expired COI and a renewed one is exactly when incidents tend to happen, because nobody's watching the clock. Build a 30-day-cancellation-notice requirement into the staffing contract itself so you're not relying on someone remembering to send an updated certificate — the notice obligation shifts that burden onto the carrier and the agency.
Frequently asked
What's the difference between being a certificate holder and an additional insured?
Certificate holder just means you're on the distribution list to receive a copy of the certificate — it grants you no coverage. Additional insured is a separate endorsement that actually extends the policy's protection to you for claims arising from the staffed workers' operations. Always confirm additional insured status is written on its own line or attached endorsement, not assumed from your name appearing at the top of the form.
Should the staffing agency's workers comp cover me too, or do I still need my own?
You still need your own workers comp — the agency's policy covers its W-2 employees, who are the staffed trades. What you want from the agency's policy is an alternate employer endorsement and a waiver of subrogation, so their carrier can't come after you if a staffed worker is injured on your site and later claims your direction or site conditions contributed to the incident.
What's a waiver of subrogation and why does it matter here?
Subrogation is the right of an insurance carrier to recover what it paid out by suing whoever else might be at fault. Without a waiver, the agency's workers comp or GL carrier can pay a claim to the injured worker or damaged property, then turn around and sue your company to recoup that payment. A waiver of subrogation in your favor closes that door before a crew ever mobilizes.
How often should we actually re-verify a staffing agency's insurance?
At minimum, at every renewal date and at the start of every new project, even with an agency you've used before — limits, endorsements, and aggregate exposure can all change between jobs. On longer projects or turnarounds spanning a policy renewal, re-verify at the renewal date rather than assuming continuity, since a lapse or reduced limit at renewal is one of the most common gaps that goes unnoticed.
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